Patents by Inventor Thuneo Wada

Thuneo Wada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Light-sensitive silver halide photographic materials
    Patent number: 4353979
    Abstract: A silver halide photographic material containing a solution of a 5-pyrazolone type magneta coupler and a high-boiling organic solvent of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represent an aliphatic or aromatic group with a carbon atom of R.sub.3 directly bonded to the phosphorus atom.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: October 12, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Sadatugu Terada, Hideaki Arai, Kenji Itoh, Hiroshi Sugita, Katsumi Matsuura, Thuneo Wada